5.003_08: OS/2-specific bugs/enhancements

This patch modifies the following files:
	hints/os2.sh 
		New flags added.
	os2/Changes
		Documentation...
	os2/Makefile.SHs
		perl_init_i18nl10n is now in main list of symbols.
	os2/OS2/PrfDB/PrfDB.pm
		@isa corrected.
	os2/os2.c
		reliable signals used, popen not used any more.
		May work under OS/2 2.1 again.
	README.os2
		misprints and minor additions.

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